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Three‐step p217+tau assay abolishes artifact signal in blood. A, A panel of 96 cerebrospinal fluid (CSF) samples was measured with two‐step p217+tau assay and three‐step p217+tau assay, revealing tight correlation (r2 = 0.939). B, A panel of 10 serum samples was measured with two‐step and three‐step p217+tau assays, revealing outlier high signal in at least four samples in two‐step assay but not in the three‐step assay
